CN102373989B - Target particulate matter filter regeneration and temperature control system - Google Patents

Target particulate matter filter regeneration and temperature control system Download PDF

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Publication number
CN102373989B
CN102373989B CN201110226918.4A CN201110226918A CN102373989B CN 102373989 B CN102373989 B CN 102373989B CN 201110226918 A CN201110226918 A CN 201110226918A CN 102373989 B CN102373989 B CN 102373989B
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China
Prior art keywords
filter
temperature
air pump
flow rate
soot load
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CN201110226918.4A
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CN102373989A (en
Inventor
E.V.冈策
H.G.桑托索
M.J.小帕拉托尔
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GM Global Technology Operations LLC
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GM Global Technology Operations LLC
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/22—Control of additional air supply only, e.g. using by-passes or variable air pump drives
    • F01N3/225—Electric control of additional air supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/101—Three-way catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F01N3/106—Auxiliary oxidation catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/14—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust gas
    • F01N2900/1411—Exhaust gas flow rate, e.g. mass flow rate or volumetric flow rate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1602—Temperature of exhaust gas apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1606—Particle filter loading or soot amount
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0802—Temperature of the exhaust gas treatment apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/024—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus
    • F02D41/0255—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to increase temperature of the exhaust gas treating apparatus to accelerate the warming-up of the exhaust gas treating apparatus at engine start
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/021—Introducing corrections for particular conditions exterior to the engine
    • F02D41/0235—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus
    • F02D41/027—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus
    • F02D41/029—Introducing corrections for particular conditions exterior to the engine in relation with the state of the exhaust gas treating apparatus to purge or regenerate the exhaust gas treating apparatus the exhaust gas treating apparatus being a particulate filter
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1445—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being related to the exhaust flow
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Toxicology (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

The invention relates to a target particulate matter filter regeneration and a temperature control system. Specifically, a regeneration system includes a particulate matter (PM) filter loading module that determines a current soot loading level of a PM filter. A PM filter temperature module determines a temperature of the PM filter. An exhaust flow rate module determines an exhaust flow rate of the PM filter. A control module deactivates an air pump of an air pump circuit and operates an engine within a predetermined range of stoichiometry based on the current soot loading, the temperature and the exhaust flow rate.

Description

Target particulate matter filter regeneration and temperature control system
Technical field
The disclosure relates to the regeneration of the particulate filter of vent systems.
Background technique
Here it is in order to introduce generally background of the present disclosure that the background providing is described.Current signature inventor's a part is operated in this background technique part and is described, and this part content and this are described in while submitting to not separately the aspect as prior art, both indefinitely also is not impliedly considered to destroy prior art of the present disclosure.
Motor produces particulate matter (PM), and described particulate matter filters out from exhaust by PM filter.PM filter is placed in the vent systems of motor.PM filter has reduced the discharge of the PM producing between main combustion period.Along with the past of time, it is full that PM filter becomes.At regeneration period, PM can burn in PM filter.Regeneration can relate to the combustion temperature that PM filter is heated to this PM.The mode that has various execution regeneration, comprising: revise engine management, use fuel burner, use catalytic oxidizer to increase delivery temperature after fuel sprays, use resistance heating coil, and/or use microwave energy.
As an example, vent systems can comprise three-way catalytic converter (TWC), oxidation catalyst (OC) and particulate matter (PM) filter, and it is positioned at engine downstream.Exhaust process TWC from motor, succeeded by OC, then filters by PM filter.TWC has reduced nitrogen oxide NOx, oxidized carbon monoxide (CO), and oxidized unburned hydrocarbon (HC) and volatile organic compound.OC is oxidized remaining CO the exhaust receiving from TWC.
From above-mentioned example, continue, the spark of motor can be delayed with heated engine and thereby thermal exhaust system, to cause the regeneration of PM filter.PM filter can be heated to for example PM combustion temperature of 600-750 ℃.The temperature of the increase of exhaust system component can reduce the working life of TWC and/or OC.And, provide this heating to need the fuel quantity increasing.
Summary of the invention
A kind of regenerative system is provided, and it comprises particulate matter (PM) filter load module, and described particulate matter (PM) filter load module is determined the current soot load level of PM filter.PM filter temperature module is determined the temperature of this PM filter.Exhaust flow rate module is determined the exhaust flow rate of PM filter.Control module is based on the stop using air pump in air pump loop operate motor in the prespecified range of stoichiometric number of current soot load, temperature and exhaust flow rate.
In further feature, a kind of regeneration method comprises that the upstream extremity of particulate matter (PM) filter via engine exhaust system receives exhaust.Ambient air is directed to the downtake pipe road of PM filter upstream via air pump.Determine the current soot load level of PM filter.Determine the temperature of PM filter.Determine the exhaust flow rate of PM filter.Inactive air pump.Based on current soot load, temperature and exhaust flow rate, in the prespecified range of stoichiometric number, operate motor.
In addition, the invention still further relates to following technological scheme.
1. a regenerative system, comprising:
Particulate matter PM filter load module, described particulate matter PM filter load module is determined the current soot load level of PM filter;
PM filter temperature module, described PM filter temperature module is determined the temperature of described PM filter;
Exhaust flow rate module, described exhaust flow rate module is determined the exhaust flow rate of described PM filter; And
Control module, described control module is based on the stop using air pump in air pump loop and operate described motor in the prespecified range of stoichiometric proportion of described current soot load, described temperature and described exhaust flow rate.
2. the regenerative system as described in technological scheme 1, further comprises:
PM filter, wherein said PM filter comprises upstream extremity, to receive the exhaust from described motor; And
Air pump loop, wherein said air pump loop is directed to ambient air in the downtake pipe road of described PM filter upstream.
3. the regenerative system as described in technological scheme 1, wherein, when described current soot load level is greater than predetermined soot load level, stop using described air pump and recently operate described motor with stoichiometry of described control module.
4. the regenerative system as described in technological scheme 1, wherein, when described temperature is greater than predetermined temperature, stop using described air pump and recently operate described motor with stoichiometry of described control module.
5. the regenerative system as described in technological scheme 1, wherein, when described exhaust flow rate is less than predetermined flow rate, stop using described air pump and recently operate described motor with stoichiometry of described control module.
6. the regenerative system as described in technological scheme 1, wherein, stop using when following situation described air pump and recently operate described motor with stoichiometry of described control module:
Described current soot load level is greater than predetermined soot load level;
Described temperature is greater than predetermined temperature; And
Described exhaust flow rate is less than predetermined flow rate.
7. the regenerative system as described in technological scheme 1, further comprises the module that prevents out of control, describedly out of controlly prevents that module accesses storage is to receive based on described current soot load level, described temperature and described exhaust flow rate the value of preventing,
Wherein saidly out of controlly prevent that module from generating regeneration halt signal based on the described value of preventing; And
Wherein said control module is based on stop using described air pump and recently operate described motor with stoichiometry of described halt signal.
8. the regenerative system as described in technological scheme 1, wherein, described control module:
Determine the temperature of the oxidation catalyst of described PM filter upstream;
When the temperature of described oxidation catalyst is greater than the first predetermined temperature, with dense pattern, operates described motor and enable described air pump; And
When the temperature of described PM filter is greater than the second predetermined temperature, the described air pump of stopping using.
9. the regenerative system as described in technological scheme 1, wherein said control module:
When described current soot load level is greater than the first predetermined soot load level, enables described air pump and operate described motor with dense pattern; And
When described current soot load level is greater than the second predetermined soot load level, the described air pump and recently operate described motor with stoichiometry of stopping using;
Wherein said the second predetermined soot load level is less than or equal to described the first predetermined soot load level.
10. the regenerative system as described in technological scheme 1, wherein, described control module:
When the pressure reduction of described PM filter surpasses predetermined pressure threshold, enable described air pump and operate described motor with dense pattern; And
When the exhaust flow rate of described PM filter is greater than predetermined flow rate, the described air pump and recently operate described motor with stoichiometry of stopping using.
11. regenerative systems as described in technological scheme 10, wherein, described pressure reduction equals poor between the inlet pressure of described PM filter and outlet pressure.
12. regenerative systems as described in technological scheme 1, wherein, described air pump loop comprises:
Described air pump;
Air valve;
The first air conduit, described the first air conduit is connected between gas exhaust manifold and described air valve;
The second air conduit, described the second air conduit is connected between described air pump and described air valve; And
The 3rd air conduit, described the 3rd air conduit is connected between described air valve and described downtake pipe road.
13. 1 kinds of vent systems, comprise the regenerative system as described in technological scheme 1 and further comprise:
Converters, described converters is connected between gas exhaust manifold and described PM filter; And
Quaternary transducer, described quaternary transducer comprises described PM filter and oxidation catalyst, wherein said oxidation catalyst is connected between described converters and described PM filter.
14. 1 kinds of regeneration method, comprising:
Reception exhaust is brought in upstream via the particulate matter PM filter of engine exhaust system;
Via air pump, ambient air is directed to the downtake pipe road of described PM filter upstream;
Determine the current soot load level of described PM filter;
Determine the temperature of described PM filter;
Determine the first row gas flow rate of described PM filter; And
Based on described current soot load, described temperature and described first row gas flow rate, the described air pump and operate described motor in the prespecified range of stoichiometric proportion of stopping using.
15. regeneration method as described in technological scheme 14, wherein, when following situation, carry out stopping using and comparing the operation of described motor with stoichiometry of described air pump:
Described current soot load level is greater than predetermined soot load level;
Described temperature is greater than predetermined temperature; And
Described first row gas flow rate is less than predetermined flow rate.
16. regeneration method as described in technological scheme 15, further comprise:
Based on described current soot load level, described temperature and described first row gas flow rate, generate the value of preventing;
Based on the described value of preventing, generate regeneration halt signal; And
Based on stop using described air pump and operate described motor with stoichiometric proportion of described halt signal.
17. regeneration method as described in technological scheme 16, further comprise:
Described air pump stop using and with stoichiometry, compare the operation of described motor after the second row gas flow rate of definite described PM filter; And
When described second row gas flow rate is more than or equal to predetermined flow rate, enables described air pump and operate described motor with dense pattern.
18. regeneration method as described in technological scheme 14, further comprise:
Determine the temperature of the oxidation catalyst of described PM filter upstream;
When the temperature of described oxidation catalyst is greater than the first predetermined temperature, with dense pattern, operates described motor and enable described air pump; And
When the temperature of described PM filter is greater than the second predetermined temperature, the described air pump of stopping using.
19. regeneration method as described in technological scheme 14, further comprise:
When described current soot load level is greater than the first predetermined soot load level, enables described air pump and operate described motor with dense pattern;
Wherein, when described current soot load level is greater than the second predetermined soot load level, carry out stopping using and comparing the operation of described motor with stoichiometry of described air pump; And
Wherein, described the second predetermined soot load level is less than or equal to described the first predetermined soot load level.
20. regeneration method as described in technological scheme 14, further comprise when the pressure reduction of described PM filter surpasses predetermined pressure threshold, enable described air pump and operate described motor with dense pattern;
Wherein, when the first row gas flow rate of described PM filter is greater than predetermined flow rate, carry out stopping using and comparing the operation of described motor with stoichiometry of described air pump; And
Wherein, described pressure reduction equals poor between the inlet pressure of described PM filter and outlet pressure.
From the description providing herein, more application will become obvious.Should be understood that, these are described and concrete example is only intended in order to illustrate, and are not intended to limit the scope of the present disclosure.
Accompanying drawing explanation
Accompanying drawing described herein, only for purpose of illustration, is not intended to limit by any way the scope of the present disclosure.
Fig. 1 is the functional block diagram combining according to the engine system of regenerative system of the present disclosure;
Fig. 2 is the functional block diagram according to engine control module of the present disclosure;
Fig. 3 is according to heat release exhaust diagram of the present disclosure;
Fig. 4 is exemplified with according to the logical flow chart of regeneration monitoring of the present disclosure and controlling method; With
Fig. 5 A and 5B are exemplified with being combined with according to of the present disclosure, the regeneration monitoring of Fig. 4 and cold starting and the regeneration method of controlling method.
Embodiment
Below being described in is only exemplary in essence, and is not intended to limit absolutely the disclosure, its application or purposes.For the sake of clarity, same reference numerals is used to refer to similar element in the accompanying drawings.As used herein, phrase " at least one in A, B and C " should be interpreted as the meaning be the logic (A or B or C) of having used nonexcludability logical OR.Should be understood that, in the situation that not changing disclosure principle, can be with the step in different order manners of execution.
As used herein, term " module " can refer to a part for the following or comprise the following: specific integrated circuit (ASIC); Electronic circuit; Combinational logic circuit; Field programmable gate array (FPGA); The processor of run time version (shared, special-purpose or in groups); Other suitable components of described function is provided; Or the combination of above-mentioned every some or all, for example SOC(system on a chip).Term " module " can comprise the storage (shared, special-purpose or in groups) of the code carried out by processor of storage.
As used above, term " code " can comprise software, firmware and/or microcode, and can refer to program, routine, function, class and/or object.As used above, term " shared " meaning is to use single (sharing) processor to carry out the some or all codes from a plurality of modules.In addition, from the some or all codes of a plurality of modules, by single (sharing) storage, stored.As used above, term " in groups " meaning is to carry out the some or all codes from individual module with one group of processor.In addition, can store some or all codes from individual module with storage stack.
Equipment described herein and method can be implemented by one or more computer programs of being carried out by one or more processors.Computer program comprises the executable instruction of processor, and described instruction is stored on the tangible computer-readable medium of nonvolatile.Computer program can also comprise the data of storage.The non-limiting example of the tangible computer-readable medium of nonvolatile is nonvolatile memory, magnetic store and optical memory.
Vent systems can comprise particulate matter (PM) filter that is positioned at engine downstream.Exhaust from motor is filtered by PM filter.At regeneration period, by the fuel of increase is offered to motor, PM filters can be heated to PM combustion temperature.Following open in, mode of execution is described to comprise that increase regeneration temperature reduces the recovery time simultaneously.PM oxidation is relevant to humidity index ground.Because this reason, regeneration temperature is higher, and PM burns sooner.Reduce the recovery time, just reduced the fuel consumption being associated with regeneration.The recovery time reducing is provided, has kept the integrity of PM filter simultaneously.
In Fig. 1, show the engine system 10 that comprises regenerative system 12.Regenerative system 12 aims at particulate matter (PM) filter 14 of vent systems 16 by controlling the heating of PM filter 14 in regeneration period heat.Regenerative system 12 minimizes the recovery time, prevents the thermal runaway of regeneration period PM filter 14 simultaneously.During thermal runaway may occur in some operating mode.Thermal runaway may occur in, for example: when PM filter load is greater than predetermined load; When the temperature of PM filter 14 is greater than predetermined temperature; And/or the exhaust flow rate in vent systems 16 is while being less than predetermined exhaust flow rate.Thermal runaway refers to that the temperature of PM filter 14 surpasses in the deteriorated degradation temperatures being associated with PM filter 14.Degradation temperatures can be approximately 1200-1300 ℃ for example.This is further described below.
Engine system 10 can be hybrid electric vehicle system, plug-in hybrid electric vehicle system, starting/stopping Vehicular system, part zero emissions vehicle (PZEV) system, ultra-low emission vehicle (SULEV) system, or other Vehicular system more more strictly discharging (for example, SULEV20), etc.Engine system 10 comprises motor 18 and vent systems 16.Although motor 18 is depicted as spark ignition (based on gasoline or oil) motor, motor 18 provides as an example.Regenerative system 12 can be embodied on various other motors, for example diesel engine.
The mixture of motor 18 combustion airs and fuel is to produce driving torque.Air enters motor 18 by air filter 20.Air process air filter 20, and can be sucked in turbosupercharger 22.When comprising turbosupercharger 22, turbosupercharger 22 compression fresh airs.Compress greatlyr, the output of motor 18 is larger.When comprising air-cooler 24, pressurized air is process air-cooler 24 before entering intake manifold 26.
Air in intake manifold 26 is assigned in cylinder 28.Fuel is ejected in cylinder 28 by fuel injector 30.Air/fuel mixture in 32 gas cylinders 28 of spark plug.The burning of air/fuel mixture produces exhaust.This exhaust is left cylinder 28 and is entered vent systems 16.
Regenerative system 12 comprises vent systems 16 and engine control module (ECM) 40.Vent systems 16 comprises ECM40, gas exhaust manifold 42, the first converters (TWC) 44, quaternary transducer (FWC) 46 and air pump loop 48.Alternatively, EGR valve (not shown) is recycled back into a part for exhaust in intake manifold 26.The remainder of exhaust is directed in turbosupercharger 22 to drive turbine.Turbine is convenient to compress being received from the fresh air of air filter 20.Exhaust flows through a TWC44 and enters in FWC46 from turbosupercharger 22.
The one TWC44 has reduced nitrogen oxide NOx, oxidized carbon monoxide (CO), and oxidized unburned hydrocarbon (HC) and volatile organic compound.The air/fuel of the one TWC44 based on after burning is recently oxidized exhaust.The amount of oxidation has increased the temperature of exhaust.
FWC46 comprises PM filter 14, housing 49, oxidation catalyst (OC) (catalyzer closely coupling) and/or the 2nd TWC50.PM filter 14 and the 2nd TWC50 are placed in housing 49 and have corresponding upstream extremity and downstream.The 2nd TWC50 can contact with PM filter 14, or can separate by clearance G and PM filter 14, to change the extraction flow between PM filter 14 and the 2nd TWC50.The 2nd TWC50 is also oxidized in the exhaust that is received from a TWC44 remaining CO to produce CO 2.The 2nd TWC50 can also nitrogen oxides reduction NOx and oxidation unburned hydrocarbon (HC) and volatile organic compound.The exhaust that TPM filter 14 receives from the 2nd TWC50, and filtration is present in the soot particulates in exhaust.
Air pump loop 48 comprises the first air conduit 60, air valve 62, the second air conduit 64, air pump 65 and the 3rd air conduit 66.T the first air conduit 60 is connected between gas exhaust manifold 42 and air valve 62.The first air conduit 60 can be directly connected to the exhaust duct of gas exhaust manifold 42 or a TWC44 upstream, for example, be connected to the exhaust duct 68 between gas exhaust manifold 42 and turbine 22, or be connected to the exhaust duct 70 between turbine 22 and a TWC44.The second air conduit 64 is connected between air valve 62 and air pump 65.The 3rd air conduit 66 is connected between air valve 62 and FWC46.The 3rd air conduit 66 can be connected to the exhaust duct 72 between a TWC44 and FWC46.
Air valve 62 has two operating positions and corresponding pattern.During first mode, air valve 62 is in the first position.First mode can be called cold starting pattern.When in first mode, use air pump 65 that ambient air is directed to the first air conduit 60.Ambient air may be directed to gas exhaust manifold 42 and/or the outlet valve of motor 18.
During the second pattern, air valve 62 is in the second place.The second pattern can be called regeneration mode or dense operator scheme.During regeneration mode and dense operator scheme, use air pump 65 that ambient air guiding is entered in the 3rd air and/or exhaust duct 66,72.
ECM40 carrys out control engine 18 based on various sensitive informations and soot load, the position of air valve 62, air pump 65, and PM filter regeneration.More specifically, ECM40 estimates the load of PM filter 14.As the predetermined regeneration level S that loads on estimating rand/or the pressure reduction P on PM filter 14 pFwhile being greater than predetermined pressure, the position of the operation of motor 18, air valve 62 and the state of air pump 65 are controlled to cause regenerative process.The endurance of regenerative process can be based on PM filter 14 interior PM estimator and change.
At regeneration period, motor 18 operates in dense pattern, and ambient air is directed into the 3rd air and exhaust duct 66,72, so that the 2nd TWC50 is heated to regeneration temperature.Motor 18 may operate in dense pattern, and ambient air can be directed into the 3rd air and exhaust duct 66,72 based on timer 73.Timer 73 can be a part of ECM40, or can be independent timer, as shown.Utilization realizes the remainder of regenerative process by the heat of the exhaust generation of the heating of PM filter 14.
At regeneration period, to the heating of PM filter 14, be the temperature of the exhaust system component of motor 18 and/or PM filter 14 upstreams higher than normal running temperature (not for example to be increased to, for motor 93-121 ℃, the exhaust system component 200-300 ℃ for PM filter upstream) in situation, carry out.
Said system can comprise sensor 80, for determining extraction flow level, delivery temperature level, exhaust pressure level, oxygen level, air inlet flow rate, suction pressure, intake temperature, engine speed, EGR etc.Show extraction flow sensor 82, exhaust gas temperature sensor 83, back pressure transducer 85, lambda sensor 88, EGR sensor 90, intake flow sensor 92, air inlet pressure sensor 94, intake air temperature sensor 96 and engine speed sensor 98.
First row throughput, pressure and/or temperature transducer 100 can be connected to the first air conduit 60 and be positioned at the upstream of a TWC44.Second row throughput, pressure and/or temperature transducer 102 can be connected to exhaust duct 72 and between the first TWC44 and FWC46.The 3rd extraction flow, pressure and/or temperature transducer 104 can be connected to FWC46.The 3rd exhaust sensor 104 can detect the temperature of exhaust, for example, in clearance G.The 4th extraction flow, pressure and/or temperature transducer 106 can be connected to the downstream of FWC46.Control module 40 can the information based on from sensor 80 and first, second, and third, four-sensor 100,102,104,106 operate motor 18 and vent systems 16 with cold starting pattern, dense pattern and regeneration mode.Second and four-sensor 102,106 can be for detection of the entrance flow rate of PM filter 104 and outlet flow rate.
Referring now to Fig. 2, show ECM40.ECM40 comprises PM filter temperature module 150, catalyst temperature module 152, exhaust flow rate module 154, PM filter modular pressure 156, PM filter load module 158, regeneration module 160 and the module 162 that prevents out of control.The temperature of PM filter temperature module 150 monitoring PM filters 14.PM filter temperature module 150 for example can receive for example, inlet temperature signal T from PM filter temperature sensor (sensor 104,106) pFINand outlet temperature signal T (151) pFOUT(153).PM filter temperature module 150 can be based on entry signal and outlet temperature signal T pFIN, T pFOUTgenerate PM filter temperature signal T pF(155).
Catalyst temperature module 152 can be monitored the one or more temperature in TWC44 and TWC50.Catalyst temperature module 152 can receive the first and second catalyst temperature signal T cAT1(157), T cAT2(159), it has indicated the temperature of TWC44 and TWC50.Catalyst temperature module 152 can be based on the first and second catalyst temperature signal T cAT1, T cAT2generate catalyst temperature signal T cAT(161).
Exhaust flow rate in exhaust flow rate module 154 monitoring vent systems 16.Exhaust flow rate module 154 can receive for example, exhaust flow rate signal F from exhaust flow rate sensor (, sensor 100,102,104,106) 1-N(163), wherein N is integer.Exhaust flow rate module 154 can be based on exhaust flow rate signal F 1-Nbecome exhaust flow rate signal F next life eXH(165).
PM filter modular pressure 156 can be determined the pressure reduction P on PM filter 14 pF(167).Pressure reduction P pFcan be based on entrance flow rate signal F iN(169), outlet flow rate signal F oUT(171) and engine speed signal ENG(173) determine.Entrance flow rate signal F iNwith outlet flow rate signal F oUTcan be generated by for example sensor 104,106.Exhaust flow rate signal F 1-Ncan comprise flow rate signal F iN, F oUT.Pressure reduction P pFinlet pressure that can be based on PM filter 14 and the difference between outlet pressure determine, the inlet pressure of described PM filter 14 and outlet pressure can for example be provided by sensor 104,106.
PM filter load module 158 is estimated the soot load S of PM filter 14 l(175).PM filter load module 158 can the exhaust pressure drop based on such as on vehicle mileage number, exhaust pressure, PM filter by Forecasting Methodology etc. (pressure reduction P for example pF) and so on parameter estimate soot load S l.Mileage number refers to vehicle mileage number, its roughly corresponding to or can be used to estimate the operating time of vehicle motor and/or the air displacement generating.As example, regeneration can be performed at vehicle about 200～300 mphs of having advanced.The soot amount generating depends on the vehicle operating of going up during this period of time.While operating in idling speed, generate cigarette ash still less when operating in travelling speed.The air displacement generating is relevant with the soot load state in PM filter.
Exhaust pressure can be used to the air displacement that estimation generates in a period of time section.When exhaust pressure surpasses predetermined pressure threshold or when exhaust pressure is reduced to lower than predetermined pressure threshold, can carry out regeneration.For example, when entering the exhaust pressure of PM filter over predetermined pressure threshold, can carry out regeneration.As another example, when the pressure of exhaust that leaves PM filter is during lower than predetermined pressure threshold, can carry out regeneration.
Exhaust pressure drop can be for estimating the soot amount in PM filter.For example, along with the increase of pressure drop, soot load amount also increases.The exhaust pressure that exhaust pressure drop can enter by determining PM filter deducts the exhaust pressure of leaving PM filter and determines.Vent systems pressure transducer can be used to provide these pressure.
Forecasting Methodology can comprise the determining of one or more power operation situations, described power operation situation for example: engine loading, fuel adding scheme (mode, volume etc.), fuel injection timing and exhaust gas recirculatioon (EGR) level.Can use accumulation weight factor based on engine condition.Accumulation weight factor is relevant with soot load.When accumulation weight factor surpasses threshold value, can carry out regeneration.
Regeneration module 160 is controlled regeneration, comprises based on various parameters and starts, suspends and stop or finishing regeneration.For example, regeneration module 160 can be based on PM filter temperature signal T pF, catalyst temperature signal T cAT, exhaust flow rate signal F eXH, engine speed signal ENG, soot load S letc. control regeneration.Regeneration module 160 can generate air pump signal AIRPUMP (177), fuel control signal FUEL (179), and/or spark control signal SPARK (181) based on described parameter.The air pump signal AIRPUMP air pump 65 of enabling and stop using.
Out of controlly prevent from the module 162 various parameters of monitoring and determine when having thermal run away condition.Thermal run away condition refers to when some parameter value makes thermal runaway may occur.Thermal run away condition can be based on for example soot load S l, PM filter temperature signal T pFwith exhaust flow rate signal F eXHdetermine.Soot load is larger, and the temperature flow rate higher and/or PM filter of PM filter 14 is lower, and PM filter 14 is more likely in regeneration period generation thermal runaway event.Out of controlly prevent that module 162 from can monitor soot load S l, PM filter temperature signal T pF, and exhaust flow rate signal F eXHthereby, based on these parameters, prevent that PM filter 14 from thermal runaway event occurring.
The module 162 generation regeneration halt signal PAUSE (183) that prevent out of control, to make regeneration suspend when there is thermal run away condition.Regeneration module 160 suspends regeneration based on halt signal PAUSE.Regeneration halt signal PAUSE can also indicate when continue regeneration.When this can occur in thermal run away condition and no longer exists.Regeneration is suspended and can comprise inactive air pump 65 and recently operate motor 18 with stoichiometry.With stoichiometry, recently operate and reduced oxygen level, and stop the generative fuel filling of CO and HC.
In one embodiment, out of controlly prevent that module 162 can be by soot load S l, PM filter temperature signal T pF, and exhaust flow rate signal F eXHwith predetermined soot load, temperature and exhaust flow rate threshold value S th, T thand F th(being jointly designated as 185) compares.Out of controlly prevent that module 162 from signal to regeneration module 160, to make to suspend regeneration: soot load S when following situation lbe greater than soot load threshold value S th; PM filter temperature signal T pFbe greater than temperature threshold T th; And, exhaust flow rate signal F eXHbe less than exhaust flow rate threshold value F th.
Threshold value S th, T thand F thcan not fixed value, and can be based on soot load S l, PM filter temperature signal T pF, and exhaust flow rate signal F eXHadjust.For example,, as soot load S lincrease and surpass soot load threshold value S thtime, temperature threshold T thcan reduce and/or exhaust flow rate threshold value F thcan increase.As another example, as exhaust flow rate signal F eXHbe reduced to exhaust flow rate threshold value F thwhen following, soot load threshold value S lwith temperature threshold T thcan reduce.As another example, as PM filter temperature signal T pFincrease and surpass temperature threshold T thtime, soot load threshold value S lcan reduce and exhaust flow rate threshold value F thcan increase.
In another embodiment, out of controlly prevent that module 162 is based on soot load S l, PM filter temperature signal T pFwith exhaust flow rate signal F eXHout of control, search the value of preventing PREV (187) in preventing table 164.Out of controlly prevent that table 164 is stored in storage 166.Out of controlly prevent that module 162 from determining whether to suspend based on the value of preventing PREV and regenerate and generate regeneration halt signal PAUSE.In another mode of execution, out of controlly prevent that module 162 from can generate halt signal PAUSE by the function based on parameter, described parameter comprises: soot load S l, PM filter temperature T pFwith exhaust flow rate signal F eXH.
In Fig. 3, show heat release exhaust diagram.In order to start the granules regeneration in PM filter 180, motor may operate in dense pattern.Dense pattern refers to the air/fuel in the dense side of stoichiometric proportion and recently operates motor.When power operation is during in dense pattern, the oxygen in vent systems reduces.Because the oxygen level in vent systems reduces, so being pumped in vent systems, ambient air works with permission OC182, for example, make FWC that CO is converted to carbon dioxide (CO 2).This conversion causes the temperature of OC182 to increase.
OC182 receives heat energy and exhaust from motor, and described exhaust comprises products of combustion, for example, and hydrogen (H 2), hydrocarbon (HC), and carbon monoxide (CO).OC182 also receives oxygen (O from air pump 2).OC182 oxidation CO and HC, and the temperature that raises, it has caused large exothermic reaction, this exothermic reaction is delivered to PM filter 180 and advances along PM filter 180, the PM in the PM filter 180 that simultaneously burnt.The temperature of OC182 is added to regeneration temperature.Sampler ignition provides the cold start emission reducing.
Mode of execution disclosed herein is brought up to high regeneration temperature fast by the temperature of PM filter, and described high regeneration temperature is greater than minimum regeneration temperature.This has reduced the recovery time, and has reduced the fuel consumption being associated with regeneration.Minimum regeneration temperature refers to the PM burning of PM filter 14 or the minimum temperature of lighting.The minimum regeneration temperature of an example is 350-600 ℃, and it depends on that whether PM filter 14 is catalyzed.In one embodiment, minimum regeneration temperature is about 600-650 ℃.High regeneration temperature can be 650-700 ℃ for example.In another embodiment, high regeneration temperature is greater than minimum regeneration temperature, and the degradation temperatures (for example 1200-1300 ℃) that is less than PM filter 14 for example, with predetermined safety range (, 200-400 ℃).Regeneration temperature is larger, and regenerative process is performed sooner.
In Fig. 4, show the logical flow chart that cold starting and regeneration method are described.Although the method is the engine system 10 and the ECM40 that relate generally to Fig. 1-2, describe, the method can be applied to other mode of execution of the present disclosure.The method can start from 200.Control described below can be carried out by ECM40, and/or is carried out by one or more modules of ECM40.
201, generate sensor signal.Described sensor signal can comprise: extraction flow signal, exhaust temperature signal, discharge pressure signal, oxygen signal, charge flow rate signal, suction pressure signal, intake air temperature signals, engine speed signal, EGR signal etc., it can sensor 80 and 100-106 in above-mentioned Fig. 1 and Fig. 2 generate.
Whether the regeneration mode of determining PM filter 14 at 202, ECM40 is effective.Regeneration can be by being used the method providing in for example Fig. 5 A and Fig. 5 B to start.At regeneration period, motor 18 can operate with dense pattern, and air pump 65 can be effective.Task 204 can be performed when regeneration mode is effective.
In 204, PM filter load module 158, estimate the soot load S of PM filter 14 l, as mentioned above.206, the definite soot load S of module 162 that prevents out of control lwhether be greater than predetermined soot load threshold value S th.As soot load S lbe greater than predetermined threshold S thtime, out of controlly prevent that module 162 from advancing to 208, otherwise turn back to 201.Predetermined soot load threshold value S th(the second predetermined soot load level) can be less than or equal to for causing the predetermined threshold S of regeneration r(the first predetermined soot load level).Task 312 referring to Fig. 5 A and 5B.
In 208, PM filter temperature module 150, estimate the temperature of PM filter 14, and generate PM filter temperature signal T pF.210, the definite PM filter temperature signal T of module 162 that prevents out of control pFwhether be greater than temperature threshold T th.As PM filter temperature signal T pFbe greater than temperature threshold T thtime out of controlly prevent that module 162 from advancing to 212, otherwise turn back to 201.
212, exhaust flow rate module 154 can be estimated the flow rate of PM filter 14.Exhaust flow rate module 154 can generate the exhaust flow rate signal F of the flow rate of having indicated PM filter 14 eXH.214, the definite exhaust flow rate signal F of module 162 that prevents out of control eXHwhether be less than exhaust flow rate threshold value F th.Exhaust flow rate threshold value F thcan be with every cubic meter per second (m 3/ s) be the predetermined threshold of unit, it is for example, with for example tickover speed (, 500-700 rpm (rpm)) relevant.Tickover speed can occur in when for example the accelerator of motor 18 does not have " stepping on ".As another example, exhaust flow rate threshold value F thcan join with preset engine velocity correlation, described preset engine speed is greater than tickover speed with predetermined safety speed scope (for example, 50-200rpm).ECM40 and/or regeneration module 160 can be at exhaust flow rate signal F eXHbe less than exhaust flow rate threshold value F thtime advance to 216, otherwise return to 201.
During task 206,210 and 214, out of controlly prevent that module 162 from can determine whether to suspend the regeneration of PM filter 14.Task 206,210 and 214 can be carried out during same time section.Task 206,210 and 214 can be substituted or therewith carry out by the task of searching and/or functional task.Out of controlly prevent that module 162 can be based on soot load S l, PM filter temperature signal T pFwith exhaust flow rate signal F eXHout of control, search the value of preventing PREV in preventing table 164, and generate halt signal based on the value of preventing PREV.Out of controlly prevent that module 162 can be based on soot load S l, PM filter temperature signal T pFwith exhaust flow rate signal F eXHfunction generate halt signal PAUSE.When being suspended, regeneration executes the task 216.
216, regeneration module 160 suspends regeneration (PM filter protected mode).Regeneration module 160 and/or the ECM40 air pump 65 of can stopping using, and for example, with stoichiometric proportion (, the air/fuel of 14.7:1 ratio) and/or operate motor 18 in the prespecified range of stoichiometric proportion.This can be by the oxygen O in vent systems 16 2percentage be reduced to roughly 0.5%, this has prevented that regeneration from continuing.With stoichiometric proportion, operate the oxygen concentration having reduced in vent systems 16 and PM filter 14, this has prevented that regeneration from continuing.Reduce oxygen concentration levels, reduced the temperature of PM filter 14.This has limited the peak value of temperature in PM filter 14.Owing to operating with stoichiometric proportion, so the emission performance such as PZEV emission performance is maintained.
218, regeneration module 160 determines whether regeneration completes.If regenerated, execute the task 220.If regenerated, control and can return to 201, return to 310 (if methods of execution graph 5), or in 226 end, as shown.
220, the definite exhaust flow rate signal F of module 162 that prevents out of control eXHwhether be more than or equal to exhaust flow rate threshold value F th.As exhaust flow rate signal F eXHbe more than or equal to exhaust flow rate threshold value F thtime, ECM40 and/or regeneration module 160 can advance to 222.Although comprising, task 220 checks exhaust flow rate signal F eXHwhether be more than or equal to exhaust flow rate threshold value F thbut other parameter testing can be performed before advancing to task 222.Parameter testing for example can comprise: (i) whether the soot load that checks PM filter 14 is greater than soot load threshold value S th; And the (ii) temperature T of PM filter 14 pFwhether be greater than temperature threshold T th.
222, regeneration module 160 and/or ECM40 reactivate air pump.224, regeneration module 160 and/or ECM40 turn back to dense pattern and operate motor 18.ECM40 can turn back to task 201 after task 224.
In Fig. 5 a and Fig. 5 b, show the logical flow chart that cold starting and regeneration method are described.Although the method is the engine system 10 and the ECM40 that relate generally to Fig. 1-2, describe, the method can be applied to other mode of execution of the present disclosure.The method can start from 300.Control described below can be carried out by ECM40, and/or is carried out by one or more modules of ECM40.
301, generate sensor signal.Described sensor signal can comprise: extraction flow signal, exhaust temperature signal, discharge pressure signal, oxygen signal, charge flow rate signal, suction pressure signal, intake air temperature signals, engine speed signal, EGR signal etc., it can sensor 80 and 100-106 in above-mentioned Fig. 1 and Fig. 2 generate.
302, control the Current Temperatures T that determines OC and/or FWC (for example, the OC of the 2nd TWC50 and FWC46) oCwhether be less than CO exothermic temperature T cOEx(the first predetermined temperature).In one embodiment, CO exothermic temperature T cOExit is 250 ℃.In another embodiment, CO exothermic temperature T cOExit is 300 ℃.Temperature T oCfor example the information based on from exhaust sensor 104 and/or user's formula 1 and 2 are determined.T startit is the initial temperature of OC and/or FWC.E addedMasscO, the H that is for example provided to OC 2quality with HC.HL is the heat loss of OC.K is constant.F ebe extraction flow, it can be to be fed to the Mass Air Flow of cylinder (for example, cylinder 28) and the function of fuel quantity.Mass Air Flow determines by Mass Air Flow sensor, for example, and intake flow sensor 92.
Figure 2011102269184100002DEST_PATH_IMAGE001
At Current Temperatures T oCbe less than CO exothermic temperature T cOExtime, control and advance to 304, otherwise control, advance to 310.
304, air valve (for example, air valve 62) is positioned to the primary importance for engine cold starting.In primary importance, air can be sent to gas exhaust manifold (for example, gas exhaust manifold 42) from air valve, rather than for example, from the location point place in air valve to the TWC (a, TWC44) downstream.306, air pump (for example, air pump 65) is activated to air pump is delivered in gas exhaust manifold.
308, control and again determine Current Temperatures T oCwhether be less than CO exothermic temperature T cOEx.At Current Temperatures T oCbe more than or equal to CO exothermic temperature T cOExtime, control and advance to 310.Carrying out at 302-308 of task allows the temperature of vent systems to be increased to normal running temperature.This is increased to the temperature for being oxidized by the temperature of the OC of vent systems rapidly.At Current Temperatures T oCbe more than or equal to CO exothermic temperature T cOExtime, air pump can be deactivated.
310, control the soot load of estimating PM filter, as mentioned above.312, control and determine current soot load S lwhether be greater than soot load threshold value S r.At current soot load S lbe greater than lower threshold S rtime, control and advance to 316, otherwise control, advance to 314.314, the control air pump of can stopping using, if air pump is not stopped using after 308.316, control and determine Current Temperatures T oCwhether be more than or equal to CO exothermic temperature T cOEx.At Current Temperatures T oCbe more than or equal to CO exothermic temperature T cOExtime, control and advance to 318.Control to allow for example, for example, by the normal running (, operating in stoichiometric proportion pattern) of motor and the normal running of vent systems (air pump is inactive) OC and/or FWC to be heated to CO exothermic temperature T cOEx.
318, control with dense pattern and operate motor to generate CO and HC.Dense pattern is used to OC and/or FWC to be heated to regeneration temperature.OC and/or FWC oxidation CO and HC.The temperature of OC and/or FWC increases, for example, from normal running temperature, be increased to regeneration temperature.
320, control to air valve and signal to be switched to second or reproduction position.322, control and determine whether air pump is enabled.When air pump not enabled, control and advance to 324.When air pump is enabled, control and advance to 326.324, enable air pump.
By operating motor, make air valve in the second place and make air pump in initiate mode with dense pattern, regenerative system is removed NOx via a TWC, and via the 2nd TWC conversion HC and CO.This regeneration period at PM filter is carried out.At regeneration period, this has reduced NOx, HC and CO discharge.Although because motor makes a TWC lack oxygen with dense pattern operation, oxygen is provided to downstream from a TWC, so that the HC and the CO that allow the OC oxidation of FWC to receive.
326, control and determine Current Temperatures T oCwhether be more than or equal to PM exothermic temperature T pMEx(the second predetermined temperature).Control and allow Current Temperatures T oCon increase or slope, rise fast (within a predetermined period of time) to PM exothermic temperature T pMEx.The temperature that the regeneration of PM filter can start from OC, PM filter and/or FWC is more than or equal to PM exothermic temperature T pMExin predetermined amount of time.Obtain the PM exothermic temperature (minimum temperature) of OC, PM filter and/or FWC to start soot combustion.Be only for example, depend on that whether PM filter is catalyzed, this minimum temperature can be 350-650 ℃ roughly.At Current Temperatures T oCbe more than or equal to PM exothermic temperature T pMExtime, control and advance to 328.
328, enable timer.Timer is for determining Current Temperatures T oCbe more than or equal to PM exothermic temperature T pMExwhether reached predetermined amount of time.
330, control and determine Current Temperatures T oCwhether be more than or equal to PM exothermic temperature T pMExwith predetermined amount of time.When timer is more than or equal to predetermined amount of time, controls and advance to 335, otherwise advance to 332.332, timer increases progressively.
335, can start regeneration monitoring and the controlling method of Fig. 4.Can be in regeneration mode effectively regeneration monitoring and the controlling method of execution graph 4 when (that is, at PM filter 14 regeneration periods).336, control and determine whether regeneration completes.Task 335 and 336 can be carried out during the identical time period.When regeneration completes, control the task 338 that advances to.
338 and 340, air pump can be stopped using, and motor may operate in stoichiometric proportion pattern.When reaching enough PM temperature, can stop dense pattern operation.Motor can be only the burning that is enough to be used in cigarette ash with the duration of dense pattern operation, then just can turn back to the operator scheme of stoichiometric proportion.After 340, control can turn back to 310.
In use, control module determines when PM filter needs regeneration.This is determined is the soot levels based in PM filter.Alternatively, regeneration can regularly be carried out, or carries out based on event.Control module can estimate when whole PM filter needs regeneration, or when the region in PM filter needs regeneration.
Above-mentioned task in Fig. 4,5A and 5B can be only illustrated examples; Depend on application, these tasks can be by sequentially, synchronously, side by side, continuously, carry out during the overlapping time period or with different order.
The monitoring of above-mentioned PM filter and method for controlling reproduction have prevented the thermal runaway event of PM filter by removing heat release fuel and minimizing oxygen concentration level, simultaneous minimization relevant to PM filter regeneration fuel used.These methods have also maintained emission control when regeneration suspends.Because motor and thereby the TWC of vent systems with stoichiometric proportion operation, so emission control is maintained.These methods contribute to maintain at the whole life period of vehicle integrity and the serviceability of PM filter.
Target P M filter method of the present disclosure has minimized the quantity of the parts that regeneration period fuel used and temperature raise.This has increased the life-span of exhaust component, for example, be connected to the TWC of PM filter housings upstream.Target P M filter method of the present disclosure is included in the regeneration period of PM filter and removes NOx and conversion HC and CO.
Those skilled in the art can recognize that from above stated specification extensive instruction of the present disclosure can implement with various forms.Therefore, although the disclosure comprises particular example, true scope of the present disclosure should not be limited to this, clear because other modification will become after those skilled in the art have studied accompanying drawing, specification and claims.

Claims (18)

1. a regenerative system, comprising:
Particulate matter PM filter load module, described particulate matter PM filter load module is determined the current soot load level of PM filter;
PM filter temperature module, described PM filter temperature module is determined the temperature of described PM filter;
Exhaust flow rate module, described exhaust flow rate module is determined the exhaust flow rate of described PM filter; And
Control module, described control module:
Based on regenerate PM filter and enable the air pump in air pump loop of described current soot load, described temperature and described exhaust flow rate;
When described exhaust flow rate is less than predetermined flow rate, suspend the regeneration of PM filter, the air pump in air pump loop of stopping using, and operate motor in the prespecified range of stoichiometric proportion; And
When described exhaust flow rate is more than or equal to described predetermined flow rate, reactivates described air pump and operate motor with dense pattern.
2. regenerative system as claimed in claim 1, further comprises:
PM filter, wherein said PM filter comprises upstream extremity, to receive the exhaust from described motor; And
Air pump loop, wherein said air pump loop is directed to ambient air in the downtake pipe road of described PM filter upstream.
3. regenerative system as claimed in claim 1, wherein, when described current soot load level is greater than predetermined soot load level, stop using described air pump and recently operate described motor with stoichiometry of described control module.
4. regenerative system as claimed in claim 1, wherein, when described temperature is greater than predetermined temperature, stop using described air pump and recently operate described motor with stoichiometry of described control module.
5. regenerative system as claimed in claim 1, wherein, stop using when following situation described air pump and recently operate described motor with stoichiometry of described control module:
Described current soot load level is greater than predetermined soot load level;
Described temperature is greater than predetermined temperature; And
Described exhaust flow rate is less than predetermined flow rate.
6. regenerative system as claimed in claim 1, further comprises the module that prevents out of control, describedly out of controlly prevents that module accesses storage is to receive based on described current soot load level, described temperature and described exhaust flow rate the value of preventing,
Wherein saidly out of controlly prevent that module from generating regeneration halt signal based on the described value of preventing; And
Wherein said control module is based on stop using described air pump and recently operate described motor with stoichiometry of described halt signal.
7. regenerative system as claimed in claim 1, wherein, described control module:
Determine the temperature of the oxidation catalyst of described PM filter upstream;
When the temperature of described oxidation catalyst is greater than the first predetermined temperature, with dense pattern, operates described motor and enable described air pump; And
When the temperature of described PM filter is greater than the second predetermined temperature, the described air pump of stopping using.
8. regenerative system as claimed in claim 1, wherein said control module:
When described current soot load level is greater than the first predetermined soot load level, enables described air pump and operate described motor with dense pattern; And
When described current soot load level is greater than the second predetermined soot load level, the described air pump and recently operate described motor with stoichiometry of stopping using;
Wherein said the second predetermined soot load level is less than or equal to described the first predetermined soot load level.
9. regenerative system as claimed in claim 1, wherein, described control module:
When the pressure reduction of described PM filter surpasses predetermined pressure threshold, enable described air pump and operate described motor with dense pattern.
10. regenerative system as claimed in claim 9, wherein, described pressure reduction equals poor between the inlet pressure of described PM filter and outlet pressure.
11. regenerative systems as claimed in claim 1, wherein, described air pump loop comprises:
Described air pump;
Air valve;
The first air conduit, described the first air conduit is connected between gas exhaust manifold and described air valve;
The second air conduit, described the second air conduit is connected between described air pump and described air valve; And
The 3rd air conduit, described the 3rd air conduit is connected between described air valve and described PM filter.
12. 1 kinds of vent systems, comprise regenerative system as claimed in claim 1 and further comprise:
Converters, described converters is connected between gas exhaust manifold and described PM filter; And
Quaternary transducer, described quaternary transducer comprises described PM filter and oxidation catalyst, wherein said oxidation catalyst is connected between described converters and described PM filter.
13. 1 kinds of regeneration method, comprising:
Reception exhaust is brought in upstream via the particulate matter PM filter of engine exhaust system;
Via air pump, ambient air is directed to the downtake pipe road of described PM filter upstream;
Determine the current soot load level of described PM filter;
Determine the temperature of described PM filter;
Determine the exhaust flow rate of described PM filter;
Based on regenerate PM filter and enable the air pump in air pump loop of described current soot load, described temperature and described exhaust flow rate;
When described exhaust flow rate is less than predetermined flow rate, suspend the regeneration of PM filter, the air pump in air pump loop of stopping using, and operate motor in the prespecified range of stoichiometric proportion; And
When described exhaust flow rate is more than or equal to described predetermined flow rate, reactivates described air pump and operate motor with dense pattern.
14. regeneration method as claimed in claim 13, wherein, when following situation, carry out stopping using and comparing the operation of described motor with stoichiometry of described air pump:
Described current soot load level is greater than predetermined soot load level;
Described temperature is greater than predetermined temperature; And
Described exhaust flow rate is less than predetermined flow rate.
15. regeneration method as claimed in claim 14, further comprise:
Based on described current soot load level, described temperature and described exhaust flow rate, generate the value of preventing;
Based on the described value of preventing, generate regeneration halt signal; And
Based on stop using described air pump and operate described motor with stoichiometric proportion of described halt signal.
16. regeneration method as claimed in claim 13, further comprise:
Determine the temperature of the oxidation catalyst of described PM filter upstream;
When the temperature of described oxidation catalyst is greater than the first predetermined temperature, with dense pattern, operates described motor and enable described air pump; And
When the temperature of described PM filter is greater than the second predetermined temperature, the described air pump of stopping using.
17. regeneration method as claimed in claim 13, further comprise:
When described current soot load level is greater than the first predetermined soot load level, enables described air pump and operate described motor with dense pattern;
Wherein, when described current soot load level is greater than the second predetermined soot load level, carry out stopping using and comparing the operation of described motor with stoichiometry of described air pump; And
Wherein, described the second predetermined soot load level is less than or equal to described the first predetermined soot load level.
18. regeneration method as claimed in claim 13, further comprise when the pressure reduction of described PM filter surpasses predetermined pressure threshold, enable described air pump and operate described motor with dense pattern;
Wherein, described pressure reduction equals poor between the inlet pressure of described PM filter and outlet pressure.
CN201110226918.4A 2010-08-09 2011-08-09 Target particulate matter filter regeneration and temperature control system Expired - Fee Related CN102373989B (en)

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US8429899B2 (en) 2013-04-30

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